<template>
  <div
      class="callback float"
      @click="onClick"
      @mousedown="down"
      @touchstart="down"
      @mousemove="move"
      @touchmove="move"
      @mouseup="end"
      @touchend="end"
      ref="fu"
  >
    <!-- <p @click="callback">返回</p> -->
<!--    <img @click="callback" src="@/assets/img/rc.png" alt/>-->
    <img @click="play" src="@/assets/img/rc.png" alt=""/>
  </div>
</template>

<script>
export default {
  components: {},
  data() {
    return {
      isLoading: false,
      flags: false, //控制使用
      position: {
        x: 0,
        y: 0,
      },
      nx: "",
      ny: "",
      dx: "",
      dy: "",
      xPum: "",
      yPum: "",
    };
  },
  methods: {
    play() {
      // this.$router.go(-1);

    },
    onRefresh() {
      // window.location.reload();
      setTimeout((res) => {
        console.log(res);
        this.isLoading = false;
      }, 1000);
    },
    down() {
      this.flags = true;
      var touch;
      if (event.touches) {
        touch = event.touches[0];
      } else {
        touch = event;
      }
      this.position.x = touch.clientX;
      this.position.y = touch.clientY;
      this.dx = this.$refs.fu.offsetLeft;
      this.dy = this.$refs.fu.offsetTop;
    },
    move() {
      if (this.flags) {
        var touch;
        if (event.touches) {
          touch = event.touches[0];
        } else {
          touch = event;
        }
        this.nx = touch.clientX - this.position.x;
        this.ny = touch.clientY - this.position.y;
        this.xPum = this.dx + this.nx;
        this.yPum = this.dy + this.ny;
        let width = window.innerWidth - this.$refs.fu.offsetWidth; //屏幕宽度减去自身控件宽度
        let height = window.innerHeight - this.$refs.fu.offsetHeight; //屏幕高度减去自身控件高度
        this.xPum < 0 && (this.xPum = 0);
        this.yPum < 0 && (this.yPum = 0);
        this.xPum > width && (this.xPum = width);
        this.yPum > height && (this.yPum = height);
        // if (this.xPum >= 0 && this.yPum >= 0 && this.xPum<= width &&this.yPum<= height) {
        this.$refs.fu.style.left = this.xPum + "px";
        this.$refs.fu.style.top = this.yPum + "px";
        // }
        //阻止页面的滑动默认事件
        document.addEventListener(
            "touchmove",
            function () {
              event.preventDefault();
            },
            false
        );
      }
    },
    //鼠标释放时候的函数
    end() {
      this.flags = false;
    },
    onClick() {
      //在这里我是作为子组件来使用的
      this.$emit("click");
    },
  },

}
</script>


<style scoped>
.callback p {
  font-size: 16px;
  color: #fff;
  background: rgba(56, 57, 58, 0.5);
  border-radius: 50%;
  text-align: center;
  width: 50px;
  height: 50px;
  line-height: 50px;
  font-family: PingFang SC;
  font-weight: 600;
  box-shadow: 0 0 10px #fff;
}

.callback img {
  display: block;
  width: 50px;
  height: 50px;
  box-shadow: 0 0 10px rgb(133, 129, 129);
  border-radius: 50%;
  background: #fff;
}

.callback {
  position: fixed;
  top: 40px;
  left: 20px;
  z-index: 99999;
}

.float {
  position: fixed;
  right: 20px;
  top: 60%;
  touch-action: none;
  text-align: center;
  width: 50px;
  height: 50px;
  border-radius: 24px;
  line-height: 48px;
  color: white;
}
</style>
